1990 Volume 40 Issue 12 Pages 891-895
A dry wear test was carried out for a couple of specimens (stator: AZ31 magnesium alloy, rotor: S50C carbon steel) with a Ohgoshi-type quick wear testing machine at room temperature. In this study, sliding distance was kept constant, namely, 200m, sixteen sorts of sliding speeds were adopted within the sliding speed range of 0.058m/s to 3.62m/s and three sorts of loads were applied. Influence of load and sliding speed on wear loss, sliding surface temperature, view of wearing surface and so on was invesitigated for AZ31 magnesium alloy. The main results obtained were as follows; (1) The value of wear loss reduced with the increment of sliding speed and showed a minimum one nearly at a critical sliding speed. After that, the value of wear loss tended to increase gradually as sliding speed bacame higher. (2) The value of wear loss apparently increased within the higher sliding speed range as load was high, while there was hardly observed the influence of load on wear loss within the lower sliding speed range. (3) The rise in the sliding surface temperature with the increase of load was not clear at the lower sliding speeds below a critical one. But after the sliding speed exceeded a critical one, the sliding surface temperature clearly became higher with the increment of sliding speed and/or load. (4) Wearing mode changed from abrasive wear to adhesion wear as sliding speed increased. This was assumed to result from the softening phenomenon of AZ31 magnesium alloy due to the rise in the sliding surface temperature.
